Understanding ScriptableSingleton

I am using ScriptableSingleton to keep track of some Player stats among a Play Session. I am using ScriptableSingleton.

I found several problems:

1. The data is persistent among Play Sessions: How can I make the data reseteable between Play Sessions?

2. I don't know how to reset this data: PlayerPrefs.DeleteAll(); is not working :?

3. I can not access the asset in the Editor: I don't know how to find it in the Hierarchy tab

4. Even if I open the asset in the Editor I can not edit it: If I manage to find the asset due indirect relation on another object, still the fields looks deactivated and I can not change them?